Search found 386 matches

by NS_Tutor_Mathias
Thu Jan 23, 2020 1:25 am
Forum: Post your questions here about any videos in the class
Topic: Stereocenter vs stereoisomers vs chirality
Replies: 5
Views: 20

Re: Stereocenter vs stereoisomers vs chirality

You are right that it is clunky, but it is totally fair to use what you know about homology and that all physiological AAs are L-enantiomers (provided they are chiral at all) to answer this. I've attached an image that explains the D/L system visually pretty intuitively. Use that, and go ahead and t...
by NS_Tutor_Mathias
Thu Jan 23, 2020 1:11 am
Forum: Post your questions here about any videos in the class
Topic: spectroscopy quiz: on aromaticity (huckel's rule)
Replies: 8
Views: 48

Re: spectroscopy quiz: on aromaticity (huckel's rule)

1) You can only either contribute what is in an existing pi bond OR a lone pair, not both. 2) Your notes are correct. I have been dancing around stating this outright a bit: An sp3 atom with a free lone pair can instead hybridize to sp2, in which case it will again have a free p orbital. This is why...
by NS_Tutor_Mathias
Thu Jan 23, 2020 12:59 am
Forum: Post your questions here about any videos in the class
Topic: Ideal gas Law video: the required conditions to be ideal?
Replies: 6
Views: 57

Re: Ideal gas Law video: the required conditions to be ideal?

Bingo! That is absolutely right. THese are the 2 separate conditions for the ideal gas law to work and it DOESN'T mean that high temperature leads to high pressure because for the temperature to be high, we hold everything else constant and for the pressure to be low, we hold everything else constan...
by NS_Tutor_Mathias
Thu Jan 23, 2020 12:53 am
Forum: Post your questions here about any videos in the class
Topic: HNMR chemical shift: what's the difference in my answer and the correct one here?
Replies: 5
Views: 25

Re: HNMR chemical shift: what's the difference in my answer and the correct one here?

Yes, but even more: Using a regular protic solvent for 1H-NMR would significantly pollute the signal you receive with that of the solvent itself. Since 1H-NMR detects protons and protic solvents have a vast abundance of those, you can expect to instead see entirely aprotic solvents or deuterated one...
by NS_Tutor_Mathias
Thu Jan 23, 2020 12:47 am
Forum: Post your questions here about any videos in the class
Topic: Lesson 3 - part 9 - vid 3; p.79 Q12
Replies: 1
Views: 7

Re: Lesson 3 - part 9 - vid 3; p.79 Q12

A Ksp (a solubility product) is always expressed as the ratio of products over reactants for the dissociation of the solid into it's constituent solutes. Since the reactant is always a solid, it is never included in the ratio, and the resulting Ksp is always a simple product of the two solutes (the ...
by NS_Tutor_Mathias
Wed Jan 22, 2020 6:30 pm
Forum: Post your questions here about any videos in the class
Topic: Lesson 3 -part 6 -vid 6; Lesson book p.71 - Q6
Replies: 3
Views: 7

Re: Lesson 3 -part 6 -vid 6; Lesson book p.71 - Q6

The formula definitely doesn't guarantee molecular geometry. Lone pairs are the most obvious case of departure from such a prediction, but in general you need to be fairly certain of the nature of those bonds in the structural formula and of the electronic configuration of the central atom. That sai...
by NS_Tutor_Mathias
Wed Jan 22, 2020 2:00 pm
Forum: Post your questions here about any videos in the class
Topic: Lesson 3 -part 6 -vid 6; Lesson book p.71 - Q6
Replies: 3
Views: 7

Re: Lesson 3 -part 6 -vid 6; Lesson book p.71 - Q6

Right, it is not described as a geometric homlog, so what kind of homology is meant is left a little bit vague. You are better off considering the network solid with each silicon bonded to 4 oxygens. This is for the most part pretty cut and dry, and I think you've extracted all the relevant informat...
by NS_Tutor_Mathias
Wed Jan 22, 2020 4:28 am
Forum: Post Questions About Exams and QBank
Topic: FL 5: section B/B question 38
Replies: 2
Views: 22

Re: FL 5: section B/B question 38

"Decreasing water reabsorption" means less water from the filtrate in the nephron is taking back up into the bloodstream. This in turn means more water is excreted, and less is retained. Which leads to a loss of blood volume and a decrease of blood pressure. The most likely circumstances for such a ...
by NS_Tutor_Mathias
Wed Jan 22, 2020 4:09 am
Forum: Post your questions here about Next Step's MCAT books
Topic: End of Chapter 1 Physics
Replies: 4
Views: 21

Re: End of Chapter 1 Physics

For #6: http://forum-mcat.nextsteptestprep.com/viewtopic.php?f=12&t=2667&sid=69958a68dbbd32a1efc91fdaea46bf91 For #7: This is an oddly designed question and has a few flaws, but what it is trying to tell you is that if theta = 30 degrees, the horizontal component of the tension vector in the scaphol...
by NS_Tutor_Mathias
Wed Jan 22, 2020 1:47 am
Forum: Post Questions About Exams and QBank
Topic: FL 5: Psychology question 59
Replies: 2
Views: 17

Re: FL 5: Psychology question 59

I wouldn't worry about this question. I will bring this to the content team's attention, as it seems not to be entirely representative of AAMC material in style and in how the content is approached. B does best describe anomie because the details provided illustrate a specific facet of the concept, ...